Add timeout parameter for scans

[Ansh5748]

What happened

Scans run indefinitely without timeout control

What did you expect to happen

• Scans should timeout after specified duration
• Clean termination of processes
• Timeout status in report

How to reproduce

1. Run scan: python main.py --target-ip localhost
2. Notice scan continues indefinitely

Error messages and logs

No error handling for long-running scans

[Ansh5748]

I'll implement the timeout feature.

Implementation Details:

1. Code Changes:

   • Add TimeoutManager class to handle scan timeouts
   • Implement graceful termination of running scans
   • Add timeout status to final report

2. New Files:

   • timeout_manager.py: Core timeout logic
   • timeout_handler.py: Cleanup operations

3. Modified Files:

   • main.py: Add timeout CLI argument
   • core.py: Integrate timeout checks
   • report_generator.py: Add timeout status

4. Testing Strategy:

   • Test various timeout scenarios
   • Verify cleanup operations
   • Check report accuracy

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